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System.NullReferenceException in Infragistics.Win.UltraWinTabbedMdi.MdiTabGroup.DirtyTabItem
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With UltraWinTabbedMdi 12.1.20121.2135, I'm getting a hard-to-reproduce NullReferenceException when changing an MDI tab's title by setting Form.Text. The stack trace starts off like this:

   at Infragistics.Win.UltraWinTabbedMdi.MdiTabGroup.DirtyTabItem(MdiTab tab, Boolean invalidate, Boolean textChanged, Boolean imageChanged)
   at Infragistics.Win.UltraWinTabbedMdi.MdiTab.OnMdiChildTextChanged(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnTextChanged(EventArgs e)
   at System.Windows.Forms.Form.OnTextChanged(EventArgs e)
   at System.Windows.Forms.Control.set_Text(String value)

I'm guessing that I may be disposing something prematurely, since I've made changes to that regard recently. However, I haven't been able to track it down. In addition, neither MdiTab.OnMdiChildTextChanged nor MdiTabGroup.DirtyTabItem seem to appear in the documentation.

The new value for Form.Text is not null, and the tab is supposed to be visible.

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